Which I never will, sir, from this day.
Chapter 37 · Jane Eyre
Context
Jane responds to Rochester's fear that she will leave again, promising she will never abandon him.
Analysis
The clipped syntax—subject, verb, object, time marker—reads like a legal oath. 'From this day' echoes marriage vows ('from this day forward'), but Jane speaks them unprompted and unasked, making the promise unilaterally. The brevity performs certainty: there's no hedging, no subordinate clause, no room for doubt.
Essay Tip
Use this to argue that Jane preempts Rochester's proposal by effectively vowing herself to him before he asks, flipping the gender script of who initiates commitment and demonstrating the equality she'll bring to their marriage.